Socket for incandescent electric lamps.



.l..w. n. UYTENBOGAART. SOCKET FOR INCANDESGENT ELECTRIC LAMPS.

Patented e b. ll, I902.

(I0 Modal.)

, Zl/Zlozeaow l- UNITED STATES PATENT QF TCE.

JOHANNES WILHELMUS HUYBERTS UYTENBOGAART, OF UTREOHT, NETHERLANDS.

SOCKET FOR INCANDESCENT ELECTRIC LAMPS.

SFEGIFIGA'I'ION forming part of Letters Patent No. 693,087, dated February 11, 1902.

Application filed May 2, 1901.

To all whom it may concern:

Be it known that I, J OHANNES WILHELMUS HUYBER'rs UYTENBOGAART, a. subject of the Queen of the Netherlands, and a resident of Utrecht, Netherlands, have invented certain new and useful Improvements in Sockets for Incandescent Electric Lamps, of which the following is a full, clear, and exact description.

The present invention relates to sockets for incandescent electric lamps; and it consists of the details of construction hereinafter set forth, and particularly pointed out in the claims.

In order to render the present specification easily intelligible, reference is had to the accompanying drawings,in which similar letters of reference denote similar parts throughout the several views.

Figure 1 is a side elevation of the lamp with its mounting adapted. to engage the socket. Fig. 2 is a vertical section through the socket, and Fig. 3 a plan view of the socket. Figs. 4 to 6 show a modified form of the socket, Fig. at being a plan view of the socket, Fig. 5 a part vertical section through the same, and Fig. 6 a View of the contact-screws seen from underneath the socket.

The lamp is provided with the mounting of the usual construction, as indicated at Z, and having two projecting pins m m advantageously arranged diametrically opposite to each other and adapted to engage the socket, as hereinafter set forth.

The socket proper consists of the upper sleeve 12, having an inwardly-projecting upper flange and a metallic lining a, preferably flanged inwardly advantageously at the top and bottom, so as to close against the inner walls of the socket Z), which is of porcelain or other suitable non-conducting material. Beneath the lower flange of the lining a the socket b is provided with an enlargement or shoulder b and with an externally-screwthreaded extension o to which is attached a cap 0, of porcelain or the like, said cap having a lower opening 0', through which the electric conductors pass. A plate (1, of non-conducting material, is fitted within the lower end of the socket 1) against the shoulder 17 and lies against the under side of the bottom inwardlyturned flange of the lining a, which lining is Serial No. 58,535. (No model.)

of conducting material, as will be readily understood. This plate cl is supported on an inher cap 6, of non-conducting material, said inner cap being provided with openingsf andi for the conductors, which are passed through the same to the contact-screws g and q, the

former of which is centrally arranged, while the latter is in contact with the lower flange of the lining a. \Vithin the latter a spiral or helical spring fits, its lower end or coil resting on the lower flange of the said lining and its upper end against the under side of the upper lining-flange. The inwardly-turned flange of the socket b is provided with two slots 0 0, preferably at diametrically opposite points of the same, through which the projections m m of the lamp sleeve or mounting are passed when the lamp is fitted into the socket. The central contact 5 of the lamp projects slightly below the under surface of the lamp end to render the contact between the said projection and the contact-screw g absolutely safe. The lower end of the spring is is tapered to lie flat on the flange of the lining.

The device operates in the following manner: In fitting the lamp into the socket the projections m mare placed in the recesses 0 0 and the socket turned. The coils of the spring 7c act as screw-threads as the projections are screwed into the socket and guide the lamp-sleeve properly into the socket. When the parts have been properly joined and the contact mad e, the spring is will yield if the lamp is turned too far, and the lamp may be continually turned in its socket, so that with the present construction there is no danger whatever of tearin g oif a screw-thread or of breaking the lamp-glass or straining the parts in any way by overscrewing the lampstem when the same is screwed into the socket. If it is desired to unscrew the lamp, it is only necessary to turn it in the opposite direction, and the gradually-inclined lower end of the spring will allow the projections of the lampstem to pass again between the coils of the spring, so that the lamp may be easily disengaged from the socket at will.

In Figs. l to 6 the device is slightly modified in that the under corner of the recesses e is rounded 01f, while the lining a is not provided with the upper and lower flanges, the

spring being simply supported between the flange of the socket b and a bottom plate I), with which the lining is provided. This plate extends over'the whole of the plate at within the lining, with the exception of the recessed part 12 Within this recess on the plate 03, but not contacting with the bottom plate I), is mounted a contact plate 19, and a correspondingplatep' is mounted at the under surface of the said plate (Z, the two plates being connected by the contact clam ping-screw 1' for the conductors. The central contact-pin 9 passes through both plates 10 p and is provided with a spring it, supported above the lower plate of the contact-plates p p and below a flange on the said pin g. This spring is sufficiently strong to carry the lamp so that y it will not rest entirely on the contact-plate p, but be carried slightly above the same. This arrangement has the advantage that the lamp-stem will be carried between the two springs 70 and h, and thus it will be protected against vibration to a very great extent, and yet the contact will always be kept closed by the spring 70, which is in contact always with some part of the lining a and the spring contact-pin g, which is always in contact with one or other of the plates pp, to which the other pole of the circuit is connected.

I claim as my invention- 1. In a socket for electric incandescent lamps, the combination ofa helical spring and means for retaining the same loosely within the socket, and a pair of lugs 'on the lampstem to screw into said spring in the manner and for the purpose substantially as described.

2. In a socket for electric incandescent lamps the combination of an inwardly-turned flange at the mouth of the socket, a helical spring within said socket and retained by said flange, said spring being free to rotate, recesses in the said flange and lugs on the stem of the lamp adapted to be passed through said recesses and engage the spring in the manner and forthe purpose substantially as described.

3. In a socket for electric incandescent lamps, the combination of a spring loosely located within the socket and serving as a screw-thread to guide the lugs of the lampstem intoproper engagement with the socketcontacts,and a central spring-pressed contactpin having a spring sufficiently strong to hold the lamp just above the bottom plate of the socket when the same has been screwed home substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

JOHANNES WILHELMUS HUYBERTS UYTENBOGAART. Witnesses: 7

AUGUST SIEGFRIED DOCEN, NiooLAAs ALADINUS DE BEER. 7 

